linux-kernel - Re: [PATCH v2 2/9] dt-bindings: fsl,fpga-qixis-i2c: extend support to also cover the LX2160ARDB FPGA

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Message-ID: <20250915202742.GA3329659-robh@kernel.org>
Date: Mon, 15 Sep 2025 15:27:42 -0500
From: Rob Herring <robh@...nel.org>
To: Ioana Ciornei <ioana.ciornei@....com>
Cc: Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Bartosz Golaszewski <brgl@...ev.pl>,
	Shawn Guo <shawnguo@...nel.org>, Michael Walle <mwalle@...nel.org>,
	Lee Jones <lee@...nel.org>, devicetree@...r.kernel.org,
	linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
	Frank Li <Frank.Li@....com>
Subject: Re: [PATCH v2 2/9] dt-bindings: fsl,fpga-qixis-i2c: extend support
 to also cover the LX2160ARDB FPGA

On Mon, Sep 15, 2025 at 03:23:47PM +0300, Ioana Ciornei wrote:
> Extend the list of supported compatible strings with fsl,lx2160ardb-fpga.
> 
> Since the register map exposed by the LX2160ARDB's FPGA also contains
> two GPIO controllers, accept the necessary GPIO pattern property.
> At the same time, add the #address-cells and #size-cells properties as
> valid ones so that the child nodes of the fsl,lx2160ardb-fpga node are
> addressable.
> 
> This is needed because when defining child devices such as the GPIO
> controller described in the added example, the child device needs a the
> reg property to properly identify its register location.
> Impose this restriction for the new compatible through an if-statement.
> 
> Signed-off-by: Ioana Ciornei <ioana.ciornei@....com>
> ---
> Changes in v2:
> - Enforce a unit address on the child gpios nodes (remove the ?)
> - Enforce the use of unit addresses by having #address-size and
>   #size-cells only for the newly added fsl,lx2160ardb-fpga compatible
> 
>  .../bindings/board/fsl,fpga-qixis-i2c.yaml    | 47 +++++++++++++++++++
>  1 file changed, 47 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/board/fsl,fpga-qixis-i2c.yaml b/Documentation/devicetree/bindings/board/fsl,fpga-qixis-i2c.yaml
> index 28b37772fb65..da21d0defa04 100644
> --- a/Documentation/devicetree/bindings/board/fsl,fpga-qixis-i2c.yaml
> +++ b/Documentation/devicetree/bindings/board/fsl,fpga-qixis-i2c.yaml
> @@ -22,6 +22,13 @@ properties:
>                - fsl,lx2160aqds-fpga
>            - const: fsl,fpga-qixis-i2c
>            - const: simple-mfd
> +      - const: fsl,lx2160ardb-fpga
> +
> +  "#address-cells":
> +    const: 1
> +
> +  "#size-cells":
> +    const: 0
>  
>    interrupts:
>      maxItems: 1
> @@ -32,10 +39,26 @@ properties:
>    mux-controller:
>      $ref: /schemas/mux/reg-mux.yaml
>  
> +patternProperties:
> +  "^gpio@[0-9a-f]+$":
> +    $ref: /schemas/gpio/trivial-gpio.yaml

This results in this schema being applied twice and more 
importantly allows any compatible listed in it to be allowed here. So I 
would drop the $ref and do this instead:

       additionalProperties: true

       properties:
         compatible:
           contains:
             enum:
               - fsl,lx2160ardb-fpga-gpio-sfp
               ...


> +
>  required:
>    - compatible
>    - reg
>  
> +allOf:
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            enum:
> +              - fsl,lx2160ardb-fpga
> +    then:
> +      required:
> +        - "#address-cells"
> +        - "#size-cells"
> +
>  additionalProperties: false
>  
>  examples:
> @@ -68,3 +91,27 @@ examples:
>          };
>      };
>  
> +  - |
> +    i2c {
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +
> +        board-control@66 {
> +            compatible = "fsl,lx2160ardb-fpga";
> +            reg = <0x66>;
> +            #address-cells = <1>;
> +            #size-cells = <0>;
> +
> +            gpio@19 {
> +                compatible = "fsl,lx2160ardb-fpga-gpio-sfp";
> +                reg = <0x19>;
> +                gpio-controller;
> +                #gpio-cells = <2>;
> +                gpio-line-names =
> +                    "SFP2_TX_EN", "",
> +                    "", "",
> +                    "SFP2_RX_LOS", "SFP2_TX_FAULT",
> +                    "", "SFP2_MOD_ABS";
> +            };
> +        };
> +    };
> -- 
> 2.25.1
>